单项选择题

A new technique（）, the gross output increased by 20 percent.

A．working out
B．having worked out
C．having been worked out
D．to have been worked out

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单项选择题
We desire that the tour guide（）us immediately of any change in plans.

A．has informed
B．informed
C．informs
D．inform
单项选择题
A programmed computer begins to show on its screen the figures you need（）

A．when switched on
B．switched on
C．to be switched on
D．being switched on
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